160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
/*
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* Tegra host1x Interrupt Management
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*
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* Copyright (C) 2010 Google, Inc.
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include "../intr.h"
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#include "../dev.h"
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/*
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* Sync point threshold interrupt service function
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* Handles sync point threshold triggers, in interrupt context
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*/
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static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
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{
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unsigned int id = syncpt->id;
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struct host1x *host = syncpt->host;
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
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schedule_work(&syncpt->intr.work);
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}
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static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
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{
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struct host1x *host = dev_id;
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unsigned long reg;
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unsigned int i, id;
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for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
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reg = host1x_sync_readl(host,
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
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for_each_set_bit(id, ®, 32) {
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struct host1x_syncpt *syncpt =
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host->syncpt + (i * 32 + id);
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host1x_intr_syncpt_handle(syncpt);
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}
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}
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return IRQ_HANDLED;
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}
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static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
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{
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unsigned int i;
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for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
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host1x_sync_writel(host, 0xffffffffu,
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HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
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host1x_sync_writel(host, 0xffffffffu,
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
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}
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}
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static void intr_hw_init(struct host1x *host, u32 cpm)
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{
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#if HOST1X_HW < 6
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/* disable the ip_busy_timeout. this prevents write drops */
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host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);
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/*
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* increase the auto-ack timout to the maximum value. 2d will hang
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* otherwise on Tegra2.
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*/
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host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);
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/* update host clocks per usec */
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host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
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#endif
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}
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static int
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_host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
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void (*syncpt_thresh_work)(struct work_struct *))
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{
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unsigned int i;
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int err;
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host1x_hw_intr_disable_all_syncpt_intrs(host);
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for (i = 0; i < host->info->nb_pts; i++)
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INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
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err = devm_request_irq(host->dev, host->intr_syncpt_irq,
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syncpt_thresh_isr, IRQF_SHARED,
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"host1x_syncpt", host);
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if (err < 0) {
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WARN_ON(1);
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return err;
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}
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intr_hw_init(host, cpm);
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return 0;
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}
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static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
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unsigned int id,
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u32 thresh)
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{
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host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
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}
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static void _host1x_intr_enable_syncpt_intr(struct host1x *host,
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unsigned int id)
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{
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
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}
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static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
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unsigned int id)
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{
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
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}
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static int _host1x_free_syncpt_irq(struct host1x *host)
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{
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unsigned int i;
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devm_free_irq(host->dev, host->intr_syncpt_irq, host);
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for (i = 0; i < host->info->nb_pts; i++)
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cancel_work_sync(&host->syncpt[i].intr.work);
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return 0;
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}
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static const struct host1x_intr_ops host1x_intr_ops = {
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.init_host_sync = _host1x_intr_init_host_sync,
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.set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
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.enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
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.disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
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.disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
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.free_syncpt_irq = _host1x_free_syncpt_irq,
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};
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